Up to 800 A with both sides grounded and remote control
RMO-G
Microhmmeters
RMO-G
Portable micro-ohmmeter with BSG safety
Contact resistance measurement in environments with high safety requirements.
Safety in the foreground
The series measures with both ground connections of the breaker in place: a current clamp powered by the instrument itself records the current diverted through the groundings and the device compensates it. The optional remote control unit starts and stops the test from a distance, and the plastic case endures field work with IP67 protection with the lid closed.
Seven models up to 800 A
From the RMO100G to the RMO800G, the ripple-free DC current rises and falls in automatically regulated ramps that remove magnetic transients; the 800 A model is the most powerful portable micro-ohmmeter of its class.
Main features
- Range from 0.1 µΩ to 999.9 mΩ, expandable up to 6 Ω.
- Typical accuracy of ±(0.1% of reading + 0.1% of full scale).
- Optional high-precision module: 0.01 µΩ resolution.
- 100 A test current continuously on every model.
- Four test modes: SINGLE, CONTIN, BSG and DTRtest.
- Memory for 500 timeand date-stamped measurements.
- Optional 58 mm thermal printer and Bluetooth.
Applications and software
Contact resistance measurement on a breaker at the substation
Applications
- Mediumand high-voltage breakers, live tank and dead tank.
- GIS bays, disconnectors and switchgear with both sides grounded.
- Busbars, cable splices, welded joints and fuses.
- Manufacturing, commissioning and maintenance per IEEE C37.09 and IEC 62271-100.
- Pass/fail criterion with Rmax limit.
PC software for control and analysis
The included PC software drives the test over USB or RS232, records results at configurable intervals in continuous mode, downloads the memory with search filters and generates fully configurable reports.
High output power
The high output voltage keeps the measuring range at high currents and accepts thin or long cables: the RMO100G tests at 100 A with 20 m cables of 16 mm², and the RMO800G generates up to 700 A with 10 m / 95 mm² cables.
| RMO-G�—�MEASUREMENT�DATA | |
|---|---|
| Resistance range | 0.1 µΩ – 999.9 mΩ (RMO100G to RMO600G); 0 – 499.9 mΩ (RMO800G); expandable up to 6 Ω |
| Resolution | 0.1 µΩ (up to 999.9 µΩ); 1 µΩ (up to 9.999 mΩ); 10 µΩ (up to 99.99 mΩ); 0.1 mΩ (up to 999.9 mΩ) |
| Resolution on optional ranges | 0.01 µΩ (0 – 99.99 µΩ, with high-precision module); 1 mΩ (expanded range up to 6 Ω) |
| Typical accuracy | ±(0.1% of reading + 0.1% of full scale) |
| Test current | Selectable, up to 800 A DC depending on model; ripple < 1% |
| High-precision module (optional) | 1 to 30 µΩ with 0.01 µΩ resolution |
| Current clamp for BSG | 30/300 A, powered by the instrument itself |
| Memory | 500 time- and date-stamped measurements |
Specifications valid at +25 °C with the recommended accessories.
The manufacturer reserves the right to change the specifications without prior notice.
RMO-G�—�TECHNICAL�SPECIFICATIONS
| RMO100G | RMO200G | RMO300G | RMO400G | RMO500G | RMO600G | RMO800G | |
|---|---|---|---|---|---|---|---|
| Maximum current | 100 A | 200 A | 300 A | 400 A | 500 A | 600 A | 800 A |
| Duration at maximum current | Continuous | 150 s | 90 s | 50 s | 30 s | 20 s | 5 s |
| Consumption at 230 V AC | 1190 VA | 1815 VA | 2400 VA | 3570 VA | 3970 VA | 4720 VA | 5010 VA |
| Full-load voltage (230 V) | 7.15 V | 6.80 V | 7.20 V | 6.70 V | 5.95 V | 5.90 V | 4.70 V |
| Weight | 8 kg | 8 kg | 8 kg | 9 kg | 9 kg | 11 kg | 11.5 kg |
Common: dimensions 405 × 165 × 330 mm (RMO100G to RMO500G without printer) or 480 × 190 × 385 mm (RMO600G, RMO800G and models with built-in printer); supply 90 – 264 V AC, 50/60 Hz; backlit 4 × 20 character LCD; USB (optional RS232 and Bluetooth); IP67 with the lid closed; operation -20 to +55 °C; storage -40 to +70 °C; humidity 5 – 95% non-condensing; altitude up to 2000 m. In CONTIN mode the standard version reaches 600 A (800 A for 5 s upon request). Standards: IEEE C37.09 and IEC 62271-100; safety EN 61010-1; EMC EN 61326-1. Specifications valid at +25 °C.
| C/ María Barbeito, 14 | Contact Contact +T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | +T [+34] 982 20 99 20 info@amperis.com | www.amperis.com |